Vacuum pump with rotating piston and a vertically arranged rotor



Nov. 16, 1965 H. BURGER 3,217,977

VACUUM PUMP WITH ROTATING PISTON AND A VERTICALLY ARRANGED ROTOR Filed Dec. 6, 1961 5 Sheets-Sheet 1 Fig.1

INVENTOR.

HERBERT B'URGE R. BY

ATT NEY;

Nov. 16, 1965 H. BURGER 3,217,977

VACUUM PUMP WITH ROTATING PISTON AND A VERTIGALLY ARRANGED ROTOR Filed Dec. 6, 1961 5 Sheets-Sheet 2 INVENTOR. HERBERT Bi'J GER. BY

Nov. 16, 1965 H. BURGER 3,217,977

VACUUM PUMP WITH ROTATING PISTON AND A VERTICALLY ARRANGED ROTOR Filed Dec. 6, 1961 5 Sheets-Sheet 5 Fig. 4

INVENTOR.

HERBERT B URGE B.

A TTORNE Y.

United States Patent 3,217,977 VACUUM PUMP WITH RUTATING PISTGN AND A VERTICALLY ARRANGED RQTOR Herbert Biirger, Lahnbeckstrasse 097a, Essen-Kray, Germany Filed Dec. 6, 1961, Ser. No. 157,534 Claims priority, application Germany, Dec. 8, 1960, R 60,398 11 Claims. (Cl. 230-151) This invention relates to rotary vacuum pumps. While, for the purpose of definiteness of description it is shown as a sliding vane type, the invention is equally useful in other types of rotary pumps.

The chief object of the invention is to provide a pump of the character described, which is greatly simplified over prior art pumps of the same type.

A further object is to provide a rotary pump Which avoids the use of iron castings and is therefore much lighter than prior art pumps of like capacity.

A still further object is to provide a pump of the character stated, wherein a simple, easily-fabricated base plate forms the central element of the pump, as well as the valve seat therefor, and to which all other parts of the pump are attached.

Another important object is to provide a simplified pump construction which enables the substitution of highstrength synthetic adhesives, such as epoxy resins, for holding elements deemed necessary in the prior art, such as threading, welding, soldering and expensive casting and machining of surfaces.

Yet another object is to provide a pump as aforesaid, which makes use of simple, easily-fabricated shapes and forms, thus reducing the costs of construction, assembly and servicing over prior art pumps of like capacity.

A further object is to provide a pump which enables the use of simple forms of glass and acidand corrosion-resisting metal parts, thus promoting longevity and highly satisfactory service in pumps which are required to handle fluids in chemical arts and processes.

Other objects and advantages of the invention will become apparent to those skilled in the art, after a study of the following detailed description, in connection with the accompanying drawing.

In the drawing:

FIGURE 1 is a central vertical section through a pump embodying the invention;

FIGURE 2 is a section taken in a plane identified by line 2-2, FIGURE 1;

FIGURE 3 is a central vertical section through the upper portion only, of a modification of the pump illustrated in FIGURES 1 and 2; and

FIGURE 4 is an elevation, partly in section, of the pump, driving motor, and their common base mounting.

Referring in detail to the drawing, 1 identifies a circular disc or plate forming the top of the rotor housing and having therethrough an inlet opening 2 and a discharge opening 3. The upper end of opening 3 is formed with a valve seat on which seats a valve 21. Comparing FIGURES 1 and 2 it is noted that this valve is a simple, generallysquare flat plate. A strip 37 secured to plate 1 by screws 40 extends across and over valve 21 to limit the rise thereof.

The circumferential walls of the rotor housing are formed as a plain cylindrical sleeve or tubular element 4, clamped between disc 1 and a lower housing cover or plate 7, by bolts 8 whose ends are threaded into tapped holes in the lower face of disc 1. Nuts 9 threaded upon the lower ends of the bolts clamp together the disc, cylinder and cover to form a rotor housing within which a rotor 5, having a radially sliding vane 6, is journaled for rotation upon an axis positioned eccentrically of the pump housing. See FIGURE 2.

The upper housing 10 is shown as a simple cylindrical cap of sheet metal and having a diameter somewhat less than that of disc 1. An oil chamber or housing 11 is formed from a cap shown as identical in form and size with cap 10. Both housings 10 and 11 are held to opposite sides of disc 1 by rims or rings 12 and 13 which interfit to receive a gasket 20 between them. As illustrated upon FIGURES l and 2, these rings are formed with four equiangularly-spaced lugs, drilled and tapped to receive cap screws 14 clamping the rings together. Cap 10 has a smooth fit within ring 12 and is secured thereto by adhesive of the type previously mentioned. Cap 11 is attached to and within ring 13 in a like manner.

A partition 15 is formed as a simple flat rectangular plate of size and shape to divide the upper housing 1t) into exhaust and intake chambers 16 and 17, respectively. This partition has its upper and vertical side edges flanged, as is clear from inspection of FIGURES 1 and 2. Gasket 20, previously mentioned, eifects a fluid-tight seal between the rim of housing 10 and disc 1. The lower edge of partition 15 is coplanar with the rim of housing 1% and bears upon a diametrically-extending portion of the gasket, as shown at FIGURE 2. The flanges of the partition are secured in fluid-tight relation with housing 10, by a highstrength resin adhesive of the epoxy type. A lead-in coupling 18 is secured about an inlet opening in the top of housing 10 and affording ingress of fluid to chamber 17. Likewise an exhaust coupling 19 is secured about an outlet opening in the top of the housing, in communication with chamber 16. As shown, these couplings are simple tubular items having flanges riveted to the housing top. Adhesive of the type previously mentioned may be applied between the meeting surfaces to assure pressure-tight joints.

From FIGURE 1 it is noted that chamber 11, externally of the pump housing therein, as well as the lower portion of exhaust chamber 16, is filled with oil which serves to seal off the pump and the exhaust valve, as well as to lubricate the moving parts of the pump. An orifice 22 through plate 1, FIGURE 2, provides communication between the housing 11 and chamber 16 to provide for free flow of oil therebetween. Gasket prevents the flow of oil into chamber 17. No gaskets or seals are required between the end surfaces of sleeve 4 and plates 1 and 7. When these surfaces are properly prepared and cleaned before assembly, traces only of oil penetrate through these joints and are not objectionable.

Rotor 5 is journaled by and between an upper bearing 38 seated in a recess in the under surface of plate 1, and a lower bearing 39 in an aperture in plate 7. A drive shaft 23 has its upper end fixed with rotor 5 and extends downwardly through a seal 24 of rubber or synthetic material within a gland ring 25. This ring is secured to housing 11 by epoxy resin adhesive. This means of attachment is of especial utility because it enables ring 25 to be secured to the housing in precisely centered relation with respect to the shaft and thus, in a simple and inexpensive way, assures a perfect seal.

Referring to FIGURE 4, a base 29 has a rimmed depression 28 in its top surface. The lower end of housing 11 fits smoothly Within this depression and is secured therein by adhesive of the type mentioned. Shaft 23 has a pulley keyed to its lower end, to be driven by a belt 31 from a drive pulley 32 attached to the lower end of the vertical shaft 33 of motor 34. This motor has a flanged base 35 fitting and secured within an opening 36 in base 29. Pumps constructed in accordance with the invention may be connected in parallel or in series, as required.

FIGURE 3 shows an alternative construction wherein the upper housing comprises a tubular element 26 of glass, secured by adhesive of the type previously mentioned, in pressure-tight relation within clamping ring 12. The top of element 26 is sealed or closed by a metal plate or cap 27 having a flange which fits down over and exteriorly about element 26 and is adhesively secured thereto. Partition 15 and inlet and exhaust fittings 18 and 19 are constructed and secured in position in the way previously described for the model shown at FIGURES 1 and 2. The modification of FIGURE 3 is of particular utility in the handling of acids and corrosive fluids.

It will thus be seen that I have provided a pump attain-. ing all of the objects stated aforesaid. The parts are easily and inexpensively fabricated from sheet metal and secured together as described, by high-strength synthetic resins of the epoxy type, to form a light, strong, efficient and easily-assembled and easily-serviced structure. The caps or cups 10 and 11, being identical reduce the number of spare parts required to be kept in stock and are secured together in an efficient simple way to clamp disc 1 between them. Furthermore, the structure is easily disassembled for adjustment, repairs and replacements, simply by removing screws 14. In the form shown at FIGURE 3 the pump is of particular utility for the handling of acids and corrosive fluids.

It should also be noted that gasket 20 forms a seal (a) between rings 13 and 14, (b) between disc 1 and the rim of cap 10, and (0) between disc 1 and the lower edge of partition 15.

Having now fully disclosed the invention, what I claim and desire to secure by Letters Patent is:

1. In a rotary type pump, a flat disc having spaced inlet and exhaust openings therethrough, a cylindrical sleeve, a cover plate, bolts securing said plate to one side of said disc and clamping said sleeve therebetween to conjointly form a pump housing surrounding and in communication with said openings, a cap secured fluid-tight to the other side of said disc over and enclosing said openings, a partition in said cap between and in pressure-tight relation with said disc, between said openings, to divide said cap into discrete inlet and exhaust chambers in communication, respectively, with said inlet and exhaust openings, and a sliding vane rotor journaled in aligned bearings in said disc and cover plate and including a shaft extending through said cover plate for connection to a source of power externally of the pump.

2. A pump as in claim 1, said cap being of sheet metal and in the form of a cylindrical cup having its rim sealed in tension-free relation to said disc.

3. A pump as in claim 1, said partition being a flat generally rectangular sheet-metal item having its top and side edges flanged and adhesively secured to the respective top and side walls of said cap.

4. A rotary vacuum pump comprising, a flat circular disc having inlet and exhaust openings therethrough, a cylindrical sleeve, a cover plate, bolts attaching said plate to the under side of said disc and clamping said sleeve therebetween, said disc, plate and sleeve conjointly forming a rotor housing in communication with said openings, a rotor journaled in said housing, a first cup-like housing of sheet metal and having its rim secured to one side of said disc to enclose said sleeve and plate, a second cuplike housing of sheet metal and having its rim secured to the other side of said disc, over said openings, a flat sheet-metal partition secured within said second housing between said openings and dividing said second housing into inlet and exhaust chambers in communication with said openings, respectively, inlet and exhaust fittings fixed with said second housing in communication with said chambers, respectively, and a shaft fixed with said rotor and extending through said plate and the base of said first housing.

5. A pump as in claim 4, first and second interfitting rings each adhesively secured to and about a respective one of said cup-like housings adjacent the rims thereof,

and means clamping said rings together to secure said cuplike housings to respective opposite sides of said disc in pressure-tight relation therewith.

6. A pump as in claim 5, said partition having flanged upper and side edges adhesively secured in pressure-tight relation to the corresponding walls of said second housing, the lower edge of said partition being coplanar with the rim of said second housing, and a single gasket interposed between said disc and the lower edges of said second housing and partition.

7. In a rotary pump structure, a fiat circular disc having inlet and outlet openings therethrough, first and second identical sheet-metal cylindrical cups having a smaller diameter than said disc, first and second rings each secured to and exteriorly about a respective one of said cups conti uous the rim thereof, clamping means securing said rings together to clamp the rims of both said cups to respective sides of said disc in coaxial relation, a pump housing fixed to said disc in said first cup, and a partition in said second cup between said openings and, in cooperation with said disc and said second cup dividing the latter into inlet and exhaust chambers.

8. In a rotary pump structure as in claim 7, said pump housing comprising a cylindrical sleeve, a cover plate, bolts securing said plate to said disc exteriorly of said sleeve to clamp said sleeve therebetween, first and second aligned bearings in said disc and cover, respectively, a rotor journaled in and between said bearings within said housing, a shaft fixed with said rotor and projecting loosely through an aperture in the base of said first cup, a gland ring secured exteriorly to said base concentrically of said shaft, and an oil seal between said gland ring and said shaft.

9. A rotary pump structure as in claim 8, said first and second rings being secured to said first and second housings, said partition being secured to said second housing and said gland ring being secured to said first housing, all by epoxy adhesive.

10. In a rotary pump structure, a fiat circular disc having inlet and outlet openings therethrough, a cylindrical sleeve, a cover plate, means connecting said plate with said disc and clamping said sleeve therebetween, said disc, sleeve and plate conjointly forming a rotor housing, a rotor journaled in said housing by and between said disc and plate, first and second cup-like housings, means securing the rims of said cup-like housings to respective opposite faces of said disc, said first housing enclosing said sleeve and plate, a partition in said second housing between said openings, to form with said second housing, discrete, pressure-tight inlet and outlet chambers, and inlet and outlet fittings fixed with said second housing and in communication with said chambers respectively.

1.1. The pump structure of claim It), at least one said cup-like housing comprising a hollow glass cylinder and a flanged metal cap secured to and fitting over and about the otherwise open end of its cylinder.

References Cited by the Examiner UNITED STATES PATENTS 2,013,777 9/1935 Dennedy 230-152 2,534,153 12/1950 Widmer 103-37 2,633,292 3/1953 Voznica 230-234 X 2,759,664 8/1956 Auwarter 230-205 X 2,779,529 1/1957 Stout 230-231 X 2,779,533 1/1957 Ziock 230-153 X 2,877,947 3/1959 Wessling et a1 230-205 X 2,984,408 5/1961 Nicholas 230-231 2,992,027 7/1961 Wright et al. a 277l. 3 X

FOREIGN PATENTS 92,468 5/1959 Netherlands.

LAURENCE V. EFNER, Primary Examiner. ROBERT M. WALKER, Examiner. 

1. IN A ROTARY TYPE PUMP, A FLAT DISC HAVING SHAPED INLET AND EXHAUST OPENINGS THERETHROUGH, A CYLINDRICAL SLEEVE, A COVER PLATE, BOLTS SECURING SAID PLATE TO ONE SIDE OF SAID DISC AND CLAMPING SAID SLEEVE THEREBETWEEN TO CONJOINTLY FORM A PUMP HOUSING SURROUNDING AND IN COMMUNICATION WITH SAID OPENINGS, A CAP SECURED FLUID-TIGHT TO THE OTHER SIDE OF SAID DISC OVER AND ENCLOSING SAID OPENINGS, A PARTITION IN SAID CAP BETWEEN AND IN PRESSURE-TIGHT RELATION WITH SAID DISC, BETWEEN SAID OPENINGS, TO DIVIDE SAID CAP INTO DISCRETE INLET AND EXHAUST CHAMBERS IN COMMUNICATION, RESPECTIVELY, WITH SAID INLET AND EXHAUST OPENINGS, AND A SLIDING VANE ROTOR JOURNALED IN ALIGNED BEARINGS IN SAID DISC AND COVER PLATE AND INCLUDING A SHAFT EXTENDING THROUGH SAID COVER PLATE FOR CONNECTING TO A SOURCE OF POWER EXTERNALLY OF THE PUMP. 